Articles | Volume 15, issue 21
Research article
08 Nov 2022
Research article |  | 08 Nov 2022

Long-distance propagation of 162 MHz shipping information links associated with sporadic E

Alex T. Chartier, Thomas R. Hanley, and Daniel J. Emmons

Related authors

Mid-latitude neutral wind responses to sub-auroral polarization streams
Daniel D. Billett, Kathryn A. McWilliams, Robert B. Kerr, Jonathan J. Makela, Alex T. Chartier, J. Michael Ruohoniemi, Sudha Kapali, Mike A. Migliozzi, and Juanita Riccobono
Ann. Geophys., 40, 571–583,,, 2022
Short summary
First observations of the McMurdo–South Pole oblique ionospheric HF channel
Alex T. Chartier, Juha Vierinen, and Geonhwa Jee
Atmos. Meas. Tech., 13, 3023–3031,,, 2020
Short summary

Related subject area

Subject: Others (Wind, Precipitation, Temperature, etc.) | Technique: Remote Sensing | Topic: Data Processing and Information Retrieval
Validation of Aeolus wind profiles using ground-based lidar and radiosonde observations at Réunion island and the Observatoire de Haute-Provence
Mathieu Ratynski, Sergey Khaykin, Alain Hauchecorne, Robin Wing, Jean-Pierre Cammas, Yann Hello, and Philippe Keckhut
Atmos. Meas. Tech., 16, 997–1016,,, 2023
Short summary
Dual-frequency spectral radar retrieval of snowfall microphysics: a physics-driven deep-learning approach
Anne-Claire Billault-Roux, Gionata Ghiggi, Louis Jaffeux, Audrey Martini, Nicolas Viltard, and Alexis Berne
Atmos. Meas. Tech., 16, 911–940,,, 2023
Short summary
High-resolution 3D winds derived from a modified WISSDOM synthesis scheme using multiple Doppler lidars and observations
Chia-Lun Tsai, Kwonil Kim, Yu-Chieng Liou, and GyuWon Lee
Atmos. Meas. Tech., 16, 845–869,,, 2023
Short summary
Atmospheric boundary layer height from ground-based remote sensing: a review of capabilities and limitations
Simone Kotthaus, Juan Antonio Bravo-Aranda, Martine Collaud Coen, Juan Luis Guerrero-Rascado, Maria João Costa, Domenico Cimini, Ewan J. O'Connor, Maxime Hervo, Lucas Alados-Arboledas, María Jiménez-Portaz, Lucia Mona, Dominique Ruffieux, Anthony Illingworth, and Martial Haeffelin
Atmos. Meas. Tech., 16, 433–479,,, 2023
Short summary
Assessing and mitigating the radar–radar interference in the German C-band weather radar network
Michael Frech, Cornelius Hald, Maximilian Schaper, Bertram Lange, and Benjamin Rohrdantz
Atmos. Meas. Tech., 16, 295–309,,, 2023
Short summary

Cited articles

Ames, L. A., Newman, P., and Rogers, T. F.: VHF tropospheric overwater measurements far beyond the radio horizon, Proceedings of the IRE, 43, 1369–1373, 1955. 
Arras, C. and Wickert, J.: Estimation of ionospheric sporadic E intensities from GPS radio occultation measurements, J. Atmos. Sol.-Terr. Phy., 171, 60–63, 2018. 
Carmona, R. A., Nava, O. A., Dao, E. V., and Emmons, D. J.: A Comparison of Sporadic-E Occurrence Rates Using GPS Radio Occultation and Ionosonde Measurements, Remote Sens., 14, 581,, 2022. 
Chandra, H. and Rastogi, R. G.: Blanketing sporadic E layer near the magnetic equator, J. Geophys. Res., 80, 149–153, 1975. 
Chartier, A.: Long distance AIS links associated with sporadic-E, YouTube [video],, last access: 3 November 2022a. 
Short summary
This is a study of anomalous long-distance (>1000 km) radio propagation that was identified in United States Coast Guard monitors of automatic identification system (AIS) shipping transmissions at 162 MHz. Our results indicate this long-distance propagation is caused by dense sporadic E layers in the daytime ionosphere, which were observed by nearby ionosondes at the same time. This finding is surprising because it indicates these sporadic E layers may be far more dense than previously thought.